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The Basic Principles Of valves and fittings

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Since they run at small stress and trust in gravity to move fluids (and entrained solids), drain-waste-vent systems use fittings whose inside surfaces are as sleek as possible. The fittings might be "belled" (expanded a little in diameter) or or else formed to support the insertion of pipe or tubing http://gunnerizoet.blog2learn.com/25402672/valves-and-fittings-an-overview

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